Barking-drum.



A. H. WHITE."

BARKING DRUM.

APPLICATION FILED mus. x915.

Patented Apr. 15, 1919.

2 SHEETS-SHEET I.

Invent est:

A. H. WHITE.

BARKING DRUM.

APPLICATION FILED mmzs. m5.

1,300,795. Patented Apr. 15, 1919.

2 SHEETS-SHEET 2.

as? is b ventor:

EGHW MW L UNITED STATES PATENT OFFICE.

AMBROSE I-I. WHITE, OF NEVJ YORK, N. Y., ASSIGNOR TO INTERNATIONAL PAPER COMPANY, A CORPORATION OF NEW YORK.

IBARKING-DRUM.

To. all whom it may concern:

Be it known that I, AMBROSE H. WHITE, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Barking- Drums, ofwhich the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to means for the treatment of wood, in the conversion of the same into pulp for use in the manufacture of paper, and it has reference more particularly to that stage of the operation in which the bark is removed. For the removal of the bark, a barking drum is commonly employed, which is rotatable in a tank containing aquantity of water, the lower portion of the drum being submerged in the water, and the drum being provided with openings,

through which t'he'bark, removed from the wood by the attrition and impact of the chunks against each other, escapes into the tank. In the operation of this mechanism, the bark accumulates in the tank, and must be removed therefrom from time to time, it being necessary in elfecting such removal, to interrupt the operation of the machine. This entails loss of time, waste of material, and is otherwise objectionable.

The aim of my invention is to prevent the accumulation of the'bark in the tank to an objectionable extent, and to provide for the discharge of the same from the tank without the necessity of interrupting the operation of the barking drum in its action on the wood, and with these and other objects in view, my invention consists in providing means, adapted to act in the tank, during the operation of the drum, and serving to discharge the bark from the tank.

In the preferred embodiment of my invention, as illustrated in the accompanying drawings, the drum is provided with a series of wings or blades projecting from the periphery thereof, and adapted in the rotation of the drum, to sweep through the tank and positively remove the bark from the same, the bottom of the tank being preferably curved to correspond to the path of move ment of the outer ends of the blades; whereby the tank will be constantly freed of the bark, and its accumulation therein prevented. I do not deem this particular construction of the tank essential, however, as

Specification of Letters Patent.

Patented Apr. 15, 1919.

Application filed January 26, 1915. Serial No. 4,575.

the advantages of the invention may be realized by providing the tank with a fiat bottom, in which case, while an accumulation of the bark on the bottom would be permitted, the blades would prevent the collection of the bark to an objectionable extent,

and the accumulated bark itself would, by

the passage of the blades thereover, form in effect a curved bottom, and the blades would remove and discharge such additional bark as might collect thereon.

I show in the accompanying drawings, one form of apparatus by way of example, illustrating my invention, but it will be manifest to the skilled mechanic that the detailed features of construction thereof may be variously modified and changed without departin from the limits of my invention; and it will be understood that the invention is not limited to any particular form or construction of the parts, except in so far as such limitations are specified in the claim.

In the accompanying drawings:

Figure 1 is a side elevation of a barkin cylinder having my invention applie therein.

Fig. 2 is a transverse sectional elevation on the line aa of Fig. 1.

1 represents a tank adapted to contain a quantity of water, and in the present instance provided with a curved bottom 2. Extending within the tank, is a horizontal rotatable drum 3 adapted to contain the wood to be barked, and provided with openings 4t therein through which the bark, removed from the wood, escapes into the tank. The drum is so mounted in the tank that its lower portion will be submerged in the water as shown'in Fig. 2, and the drum being rotated, and chunks of wood fed into its reoeiving end, they will be agitated and tumbled against each other, with the result that the bark will be removed, and, escaping through the openings in the drum, will pass into the tank, the bark-freed wood being discharged from the opposite end of the drum all in the well known and customary manner. The drum may be supported for rotation within the tank in any appropriate manner, in the present instance it being rotatably mounted on a number of vertical supporting rolls 5 journaled on horizontal longitudinal axes at the bottom of the tank, and extending upwardly therein to support "the surface of the drum some distance from the tank bottom. The drum is rotated in the present instance by means of a driving pinion 6, receiving its motion from a suitable source of power, and engaging an external gear ring 7 fixed to and surrounding the drum. The drum may be constructed of any suitable and appropriate form which will provide for the escape of the separated bark into the tank. As here shown it is constructed of a number of longitudinally extending angle bars 8 spaced circumferentially from each other, and firmly connected to the inner sides of a series of supporting rings 9, thereby forming in eflect a single unitary slatted structure containing openings between the angle bars.

Projecting from the periphery of the drum, is a number of wings or blades 10, of such length that in the rotation of the drum, the outer ends of the blades will move in close proximity to the curved bottom of the tank, and by such action will positively carry and discharge the bark therefrom. These blades may be formed of metal or wood or other suitable material, and in the form of construction shown, their inner edges are firmly fixed to the longitudinal angle bars 8 at intervals in the length of the drum, so that in the rotation of the drum they will pass between the supporting rolls 5, and the blades are preferably disposed so as to 00- cupy staggered relations to each other, this particular arrangement of the blades causing the strains thereon to be distributed throughout the drum.

By means of the construction described, the blades constantly sweeping through the tank in the revolution of the drum, will continuously discharge the bark-and will efi'ectually prevent the accumulation of the same to such extent as to interfere with the proper operation of the parts, or so as to necessitate any interruption in the action of the apparatus in removing thebark as has heretofore been necessary. a

The bark discharged from the tank by the blades, is delivered, together with such water as may be removed with it, into a trough 11 extending longitudinally at the side of the tank and separated therefrom by a vertical partition 12. The form and arrangement of the blades is such that the bark lifted thereby from the tank, will, as the blades move in succession past the upper edge of the partition 12, be discharged thereover into the trough, from which it may be recovered for future use. As shown in Fig. 2 the blades extend at an inclination with respect to the true radius of the drum, and the height of the upper edge of the trough is such in relation to the diameter of the drum that the blades as they pass this edge to discharge the bark will extend at a downward inclination, this inclination of the blades serving to facilitate the prompt passage of the bark into the trough.

It will be noted that in the operation of my improved mechanism, the separated bark entering the tank from the drum, is automatically and continuously discharged from the tank during the operation of the drum,

0 there being thus no interruption in the running of the apparatus, and consequently no loss of time or material is entailed in the removal of the bark. Furthermore by removing the bark in the manner described, there will be no waste of the same, and it can be fully recovered and handled for future use, such as for fuel.

Having thus described my invention, what I claim is:

In an apparatus for barking wood, the combination of a tank to contain a quantity of water, a drum to receive the wood to be barked and rotatable in the tank, said drum being provided with openings through which the bark may escape into the tank, a plurality of series of blades projecting from the exterior of the drum at intervals in its length with the blades of one series staggered with relation to the blades of another series, and said blades adapted in the rotation of the drum to sweep through the tank and remove the bark therefrom, whereby the strain on the blades will be evenly distributed throughout the length and circumference of the drum, and a trough at the side of the drum in position to receive the bark delivered by the blades.

In testimony whereof, I have aifixed my signature in presence of two witnesses.

AMBROSE '11. WHITE.

Witnesses:

CHESTER S. CoLsoN, EDWARD HUTCHINS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

